<?php
	$i = 0;
	$f = fopen("bb","r");
	$l = fgets($f);
	while(!feof($f)){
		$i++;
		$c = fgets($f);
		if(abs(intval($c)-intval($l)) != 1){
			echo $i."\n";
		}
		$l = $c;
	}
